Latch-controlling device for clutch mechanisms.



0. 0. BERGMAN. LATCH CONTROLLING DEVICE FOR CLUTCH MECHANISMS.

APPLICATION FILED I'IiB.21, 1908.

, Patented D60. 13, 1910.

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LATCH CONTROLLING DEVICE FOR OLUTOH MECHANISMS.

APPLICATION FILED PEB.21, 1908. 978,35 1. Patented Dec. 13, 1910.

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A rromvsys UNITED STATES PATENT GFFICE.

CARL OTTO BERGMAN, 0F EVANSTON, ILLINOIS.

LATCH-CONTROLLING DEVICE FOR CLUTCH MECHANISMS.

Application filed February 21, 1908.

To all whom it may concern:

Be it known that I, CARL O'r'ro BERGMAN, a subject of the Kingdom ofSweden, and a resident of Evanston, in the county of Cook and State ofIllinois, have invented a new and Improved Latch-Controlling Device forClutch Mechanisms, of which the following is a full, clear, and exactdescription.

My invention relates to clutch mechanisms, such, for instance, as areemployed upon punching and shearing machinery, my more particular objectbeing to provide means for positively locking and unlocking a latch usedfor controlling the clutch pin or analogous member used for stopping andstarting certain movable plarts.

Reference is to be ad to the accompanying drawings forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a fragmentary section upon the line z y of Fig. 3, lookingin the direction of the arrow, and showing the clutch mechanism of apunching press, the latch for controlling the clutch pin, my improvedmechanism for locking and unlocking this latch positively, and togglemechanism controllable by a cam for actuating the locking mechanism, theparts in this view being shown as occupying their normal positions, theclutch being unlocked; Fig. 2 is a view similar to Fig. 1, but showingvthe toggle mechanism and parts associated therewith as occupying theirabnormal position, so as to cause the clutch pin to grip the clutchmembers together in order that the machine may make a stroke; Fig. 3 isan enlarged fragmentary section taken substantially through the centerof Fig. 1, and showing the clutch pin for gripping together the twoclutch members, and also showing how the latch controls this clutchmember; Fig. 4 is an enlarged perspective of the clutch pin providedwith a boss to be engaged by the latch; and Fig. 5 is a fragmentaryperspective of the latch.

The pulley 6 is mounted loosely upon the shaft 7 and is driven by powerapplied in any suitable manner to the peripheral surface of the pulley.A disk 8 is keyed upon the shaft 7 and is provided with a mutilation 9.A bolt 10 is provided with a boss 10 projecting laterally therefrom. Aclutch Specification of Letters Patent.

Patented Dec. 13, 1910.

Serial No. 417,123.

15 provided with a lobe 16. Disposed adja;

centto this cam and partially within the path of the lobe 16 is afriction roller 17 ournaled upon the upper end of a lever 18. This leveris journaled upon a bracket 19 and is connected with a link 20 by aid ofa plvot pin 18.

Slidably journaled in bearings 21 is a stem 22 carrying a latch 23 ofthe form shown in Fig. 5. This latch 23 is provided with a rib 24 aboveand below which are grooves 25, 26. The stem 22 is journaled at 1tsbottom to a link 27 which is connected with the link 20 by a pivot pin27*. J ournaled upon the lower end of the link 27 is a link 28 which isadapted to engage a limiting stop 29. The link 28 is journaled at itslower end upon a stationary pin 30. A bell crank lever 31 is journaledupon this stationary pin, and a hook 32 is mounted upon a pivot pin 33carried by the bell crank lever 31 an provided with a ortion 34c forengaging the upper end 0 the link 28. A chain 35 is connected with thebell crank lever 31, the latter having an eye 36 for this purpose. Atreadle 37 is secured to the lower end of the chain 35 for the purposeof drawing the same downwardly at the will of the operator. A pin 38extends through the bell crank lever 31 and is secured to the hook 32 byaid of a joint 10. A spiral s ring 39 encircles the pin 38 and continualy exerts a tension against the bell crank lever 31. A stationary rod 41mounted upon the framework is disposed within the path of the pin 38 soas to be engaged by this pin when the bell crank lever 31 moves into theposition indicated in Fig. 2. A spiral sprin 42 is secured to the bellcrank lever 31 and normally tends to hold the same in the positionindicated in Fig. 1.

The operation of my device is as follows: The parts being in normalposition, as indicated in Fig. 1, power is applied to the pulley 6, forinstance by aid of a belt, so as to turn this pulley in a clockwisedirection, according to Fig. 1. The tension of the spring 42 now holdsthe bell crank lever 31 in its normal position, so that the portion 34of the hook 32 engages the upper end of the link 28, and keeps this linkin proper position to be drawn to the right by the hook 32, ashereinafter described. While the parts are in the position indicated inFig. 1, the latch 23 is held normally in its uppermost position. Therotation of the pulley 6 now carries the clutch pin 11 around and asthis clutch pin is mounted within the mutilation 9 the disk 8 is causedto turn a little distance. WVhen, however, the clutch pin 11 arrives atthe latch 23, the boss 11 glides into the groove 25 (see Fig. 5) andthis groove, being of gradually decreasing depth, acts as a cam surfaceand forces the clutch pin 11 back into the pulley so as to compress thespring 11'. The clutch pin 11 is thus unable to get any hold against thedisk 8, and consequently'the disk 8 and the shaft 7 are forced to stop.The shaft 7 can therefore make no movement whatever, so long as thelatch 23 is thus rigidly locked in position. Suppose, now, that theoperator desires that the shaft make a revolution, for the purpose ofenabling the machine to make a punching or shearing stroke. For thispurpose the operator depresses the treadle 37, causing the chain 35 topull upon the bell crank lever 31 which, as above explained, isjournaled upon the stationary pin 30. The hook 32 now pulls against theupper end of the lever 28 so as to turn the same slightly in a clockwisedirection, this movement turning the link 27 slightly in acontraclockwise direction, and the instant this is accomplished the hook32 disen ages the link 28, all as will be understood from Fig. 2. Thelinks 27, 28 together constitute atoggle oint,

and this joint is bent by the pull of the hook 32, the hook beingthereupon released. The result of this movement is that the link 20presses the lower end of the lever 18 slightly outward, and consequentlypresses the friction roller 17 slightly toward the shaft 7. The bendingof the toggle joint lowers the stem 22 and latch 23 so that this latchis now unable to obstruct the path of the boss 11 Hence the clutch pin11 protrudes as indicated in Fig. 3, and extends into the mutilation 9(see Figs. 1 and 2). The rotation of the pulley 6 now causes the clutchpin 11 to turn the disk 8 and consequently the shaft 7 As soon, however,as one proximate revolution of the shaft is made, the lobe 16 of the cam15 engages the friction roller 17 and turns the lever slightly in aclockwise direction, according to Fig. 2. This forces the toggle jointback into its normal position, as will be understood from Fig. 1, andcauses the hook 32 to hold it normally in that again depressed.

For the sake of clearness I have illustrated several parts of a punchingpress. I do not claim, however, all these parts as my invention.Essentially my improvement consists in the particular arrangement of thelatch 23 and its connect-ions, whereby this latch is locked and unlockedfirmly and posi tively so as to cause the clutch to grip and releasewith precision. lVIy invention further relates to the particulararrangement of the various links used in connection with the latch 23for carrying out the general purpose above indicated.

I have noticed that in punching and shearing machinery, and particularlyin punching presses, a large proportion of accidents position until thetreadle is resulting in the maiming of the hands of operators, arecaused by the fact that the clutch pin or analogous member forconnecting together the driving and driven clutch members, is not underperfect control of the latch used for actuating such clutch pin.,

claim as new and desire to secure by Letters Patent:

1. The combination, of clutch mechanism, a, latch for normally causingthe same to release periodically, toggle mechanism for locking saidlatch mechanism, a lever for.

controlling said toggle mechanism, and a cam driven by power foractuating said lever, thereby restoring said latch to its normalposition independently of the will of the operator.

2. A device of the character described,

comprising clutch members, a clutch pin mounted upon one of said clutchmembers and adapted to engage the other clutch members for the purposeof locking said clutch.

members together, a latch for momentarily throwing said clutch pin outof action, means for moving said latch into and out of the path oftravel of said clutch pin, and mechanism controllable automatically bythe rotation of a shaft for positively locking" said latch partiallywithin the path of travel of said clutch pin.

In testimony whereof I have signed my name to this specification in thepresence of. two subscribing witnesses.-

CARL OTTO BERGMAN.

Witnesses:

BERNI-IARD KRAATZ,

C. E. WVARE.

